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Date Difference
Two modes: the exact span between two dates (useful for deadlines, contracts and project planning), and date arithmetic — what date is 90 days from today, or 45 days before a due date?
100% private — everything runs in your browser, nothing is ever uploaded.
How to use it
- Pick Between dates or Add / subtract days.
- Enter the two dates, or a date and a number of days.
- The result updates instantly — copy it if you need it elsewhere.
Why it stays private
Deadlines and dates on contracts are private by nature. The arithmetic runs on your machine; there is no form posting anywhere.
Questions
Is the end date included in the count?
No — the count is the gap between the two dates, so 1 March to 2 March is 1 day. Add one yourself if you are counting inclusive days, such as hotel stays.
Do weekends show up?
The main count includes every calendar day. The result also breaks the span into total weeks and leftover days so you can eyeball working time yourself.
Can I subtract days?
Yes — enter a negative number of days in the add/subtract mode and it walks backwards.